US3907625A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for welding plastic pipe joints to plastic pipes
Assignee: Georg Fischer AG
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Filing: 1972-12-04
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Granted: 1975-09-23
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Expires: 1992-12-04
Abstract
Abstract A plastic pipe joint, integrally composed of a saddle-shaped foot plate and a pipe stub, is welded to the outer surface of a pipe by melting the concave surface of the foot plate and the entire periphery of the pipe along a cylindrical zone whose axial length is somewhat larger than the foot plate. The pipe joint is seated on the pipe surface by means of its foot plate and the plastic allowed to cool until the adjacent melted parts fuse and form a welding joint. Melting of the entire periphery of the pipe within the axial zone avoids later stresses at the welding joint.
Inventors
- 👤 Kurt Vogelsanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:06
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/80; B29C66/84; B29C66/841; B29C66/8414; B29C65/00; B29C65/02; B29C65/10; B29C65/18; B29C65/20; B29C65/34; B29C65/3404; B29C65/342; B29C65/3428; B29C65/346; B29C66/001; B29C66/0012; B29C66/0014; B29C66/00141; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/114; B29C66/1142; B29C66/13; B29C66/131; B29C66/50; B29C66/51; B29C66/52; B29C66/522; B29C66/5224; B29C66/52241; B29C66/5229; B29C66/52298; B29C66/70; B29C66/73; B29C66/739; B29C66/7392; B29C66/73921; B29C66/81; B29C66/814; B29C66/8141; B29C66/81411; B29C66/81421; B29C66/81423; B29C66/8145; B29C66/81471; B29C66/82; B29C66/822; B29C66/8221; B29C66/828; B29C66/8286; B29C66/83; B29C66/832; B29C66/8324; B29C66/83241; B29C66/861; B29C66/8614; F; F16; F16L; F16L47/00; F16L47/02; F16L47/03; F16L47/26; F16L47/28; F16L47/30; F16L55/00; F16L55/18; B29C65/3444; B29C65/3468; B29C65/3472; B29C65/3476; B29C65/348; B29C65/36; B29C65/3604; B29C65/3608; B29C65/3612; B29C65/362; B29C65/3644; B29C65/366; B29C65/3668; B29C65/3672; B29C65/3676; B29C65/368; B29C66/71; B29C66/8223; Y; Y10; Y10S; Y10S285/00; Y10S285/919; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1056; Y10T156/1057
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
155 words
THE METHOD OF WELDING A SADDLE-SHAPED PLASTIC MEMBER ONTO A PIPE OF WELDABLE PLASTIC, WHICH COMPRISES: MELTING MATERIAL OF A CONCAVE SURFACE OF THE MEMBER, MELTING MATERIAL OF THE OUTER SURFACE OF THE PIPE ALONG AN AXIAL LENGTH OF THE PIPE WHILE MAINTAINING THE STRUCTURAL INTEGRITY OF THE PIPE, MOUNTING THE CONCAVE SURFACE OF THE MEMBER ON THE PIPE AT THE AXIAL LENGTH, AND ALLOWING THE MELTED MATERIAL ON THE MEMBER AND THE PIPE TO COOL WHEREIN THE STEP OF MELTING MATERIAL ON THE OUTER SURFACE OF THE PIPE INCLUDES MELTING THE MATERIAL IN THE CIRCUMFERENTIAL DIRECTION OF THE PIPE BEYOND THE CIRCUMFERENTIAL EXTEND OF THE CONCAVE SURFACE OF THE MEMBER WHEN IT ENGAGES THE PIPE AND COMPLETELY AROUND THE PERIPHERY OF THE PIPE AND MELTING THE MATERIAL IN THE AXIAL DIRECTION OF THE PIPE BEYOND THE AXIAL EXREND OF THE CONCAVE SURFACE OF THE MEMBER IN BOTH AXIAL DIRECTING WHEN IT ENGAGES THE PIPE.
Claim 2
Independent Claim
155 words
THE METHOD OF WELDING A SADDLE-SHAPED PLASTIC MEMBER ONTO A PIPE OF WELDABLE PLASTIC, WHICH COMPRISES: MELTING MATERIAL OF A CONCAVE SURFACE OF THE MEMBER, MELTING MATERIAL OF THE OUTER SURFACE OF THE PIPE ALONG AN AXIAL LENGTH OF THE PIPE WHILE MAINTAINING THE STRUCTURAL INTEGRITY OF THE PIPE, MOUNTING THE CONCAVE SURFACE OF THE MEMBER ON THE PIPE AT THE AXIAL LENGTH, AND ALLOWING THE MELTED MATERIAL ON THE MEMBER AND THE PIPE TO COOL WHEREIN THE STEP OF MELTING MATERIAL ON THE OUTER SURFACE OF THE PIPE INCLUDES MELTING THE MATERIAL IN THE CIRCUMFERENTIAL DIRECTION OF THE PIPE BEYOND THE CIRCUMFERENTIAL EXTEND OF THE CONCAVE SURFACE OF THE MEMBER WHEN IT ENGAGES THE PIPE AND COMPLETELY AROUND THE PERIPHERY OF THE PIPE AND MELTING THE MATERIAL IN THE AXIAL DIRECTION OF THE PIPE BEYOND THE AXIAL EXREND OF THE CONCAVE SURFACE OF THE MEMBER IN BOTH AXIAL DIRECTING WHEN IT ENGAGES THE PIPE.
Claim 3
Dependent Claim
26 words
The method as in claim 1, wherein the material at the outer surface of the pipe is melted so as to form a cylindrical melted zone.
Claim 4
Dependent Claim
27 words
A method as in claim 1, further comprising the step of pressing the member against the pipe after the materials have been melted and before they cool.
Claim 5
Dependent Claim
26 words
A method as in claim 3, wherein the material at the outer surface of the pipe is melted so as to form a cylindrical melted zone.
Claim 6
Dependent Claim
27 words
A method as in claim 1, wherein the materials of the concave surface of the member and of the outer surface of the pipe are melted simultaneously.
Claim 7
Dependent Claim
26 words
A method as in claim 1, wherein melting of the material on the outer surface of the pipe includes embracing the pipe with two semi-conductor heaters.
Claim 8
Dependent Claim
28 words
A method as in claim 6, wherein melting of the concave surface of the member includes mounting the member on a convex surface of one of the heaters.
Claim 9
Dependent Claim
37 words
A method as in claim 1, wherein the step of melting the material on the surface of the pipe includes wrapping a flexible mat around the pipe and passing a heating current through conductors in the mat.
Claim 10
Dependent Claim
16 words
A method as in claim 8, wherein the mat is secured around the pipe by tongs.
Claim 11
Dependent Claim
79 words
The method as in claim 1, further comprising the step of placing an electrical heating element around the pipe before the steps of melting and mounting, then performing the step of mounting, and thereafter performing the steps of melting by passing a heating current through the element, and wherein melting the material on the concave surface of the member and the material of the outer surface of the pipe occurs simultaneously by application of heating current through the element.
Claim 12
Dependent Claim
23 words
The method as in claim 1, further comprising the step of drilling a hole through the pipe at the location of the member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |